namespace ZB.MOM.WW.OtOpcUa.Driver.AbCip.Import;

/// <summary>
///     Abstraction over an L5K text source so the parser can consume strings, files, or streams
///     without coupling to <see cref="System.IO"/>. Implementations return the full text in a
///     single call — L5K files are typically &lt;10 MB even for large controllers, and the parser
///     needs random access to handle nested DATATYPE/TAG blocks regardless.
/// </summary>
public interface IL5kSource
{
    /// <summary>Reads the full L5K body as a string.</summary>
    string ReadAll();
}

/// <summary>String-backed source — used by tests + when the L5K body is loaded elsewhere.</summary>
public sealed class StringL5kSource : IL5kSource
{
    private readonly string _text;
    public StringL5kSource(string text) => _text = text ?? throw new ArgumentNullException(nameof(text));
    public string ReadAll() => _text;
}

/// <summary>File-backed source — used by Admin / driver init to load <c>*.L5K</c> exports.</summary>
public sealed class FileL5kSource : IL5kSource
{
    private readonly string _path;
    public FileL5kSource(string path) => _path = path ?? throw new ArgumentNullException(nameof(path));
    public string ReadAll() => System.IO.File.ReadAllText(_path);
}